No substitute for these, if your HD424 earpads are worn, this is what you need to get!
Genuine Original HP EliteBook 6930P 8440P 8440W KU531AA 482962-001 Battery
Mar 07, 2017
HP Original Batteries vs cheaper clones
I bought a cheap Chinese knockoff of this battery for my HP 8440p about a year ago, and after a couple months, it couldn't hold a charge for more than 10-20 minutes. I put up with it for a while, keeping my laptop on the AC charger, but finally got tired of that constraint.. This time, I decided to go with the real deal, genuine HP battery, and it's holding up well. You get what you pay for! The genuine item may cost a few $ more, but it's money well spent.
Superlux HD668B Dynamic Semi-Open Headphones
Oct 26, 2015
Superlux HD668B
Great value, best sound for the money.
Sound is excellent, every bit as good as the Bose headphones I've tried, but not quite as good as my Sennheiser HD650s or Etymotic ER-4Ps. Still, much less money!
I bought these for listening on my computer while others are in the room.
I used to use my Etymotics for this, and while those are still my very favorites, the isolation they provide is too good if someone needs to talk to you;)
The Superlux phones let enough ambient sound in so you can still hear what's going on outside your little world of sound.
My only complaint is that they can become a bit uncomfortable after extended wear, but that's a small tradeoff given the high sound quality and very reasonable price.